Contrary to public perception, the Antarctic ozone hole has been amongst the largest on record over the past three years, new research has found. The ozone hole above Antarctica has been remarkably massive and long-lived over the past four years and chlorofluorocarbons (CFCs) are not the only things...
Ice caps are white, which reflects solar radiation. Once we get below 1 million square kilometers of icecaps left and the ocean is mostly blue, massive amounts of previously reflected solar radiation will instead be absorbed. This will cause rapid runaway heating and the release of huge amounts of methane from the sea floor and basically we're fucked.
Look this up for yourself with other sources though.
You'll want to find out how much ice coverage is left at the poles, how much we've lost this year so far, and the loss projections for if the next 5 years are as hot as 2023. Then look up what will happen to the earth with all the unreflected solar radiation we'll be absorbing without the ice caps.